The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. However, please pay special attention to the
Volume
85
Item Size
29.5M
Journal of Research of the National Bureau of Standards
Abstract
The value for the enthalpy of solution of SRM 1655 (KCl), deltaH�(500 H2O, 298.15 K)=(235.86�0.23)J�g-1 or (17.584�0.017)kJ�mol-1, was obtained from measurements in an adiabatic calorimeter, and confirmed by measurements in an isoperibol calorimeter. Enthalpy of solution measurements are reported in the temperature range 296 K to 358 K, at molalities between 0.005 and 0. 18 mol�kg-1, for various ranges of particle size up to 1000 microm, and in CO2- saturated solutions. Observations were also made relative to the hygroscopicity, removal of occluded H2O, and homogeneity of SRM 1655. Between 296 K and 303 K, deltaCp=-(2.076�0.087) J�g-1�K-1 or -(154.8�6.4) J�mol-1�K-1 for the reaction of SRM 1655 in 500 H2O.
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